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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Permeation of VOC vapours through carbon nanotube network membranes controlled electrically
 Slobodian, P. ; Říha, Pavel ; Olejník, R.
In this letter, we report the increase of permeation rates of some typical volatile organic compounds through entangled carbon nanotube networks by an electric current. The change in the permeation rate is reversible when the\ncurrent is turned off. The permeation rise is partly probably due to Joule effect and thus increased membrane temperature and vapor pressure in the vicinity of the inlet side of membrane. However, the effects of vapor polarity and electrostatic interaction of vapors and charged nanotubes seem to be also involved and contribute to the differentiation between alcohol and carbohydrate vapors permeation.
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Organic vapour sensing and thermoelectric properties of carbon nanotubes/ethylene-octene copolymer composites combined in a thermopile
 Slobodian, P. ; Říha, Pavel ; Olejník, R. ; Benlikaya, R.
A novel self-powered thermoelectric vapor sensor, whose thermogenerated voltage was modulated by chemical vapors is presented. The sensor was made of composites of oxidized multi-walled carbon nanotubes within\nethylene-octene copolymer. The multi-walled carbon nanotubes within ethylene-octene copolymer showed that the oxidation with KMnO4 enhanced its p-type electrical conductivity and that the thermoelectric power increase was proportional to the formation of new oxygen-containing\nfunctional groups on the surface of carbon nanotubes. When this composite was subjected to a saturated vapor of either heptane (aliphatic hydrocarbon), toluene (aromatic hydrocarbon) or ethanol (alcohol), its respective relative resistance increased in average by 3.6, 1.1 and 0.05.
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